138,640
138,640 is a composite number, even.
138,640 (one hundred thirty-eight thousand six hundred forty) is an even 6-digit number. It is a composite number with 20 divisors, and factors as 2⁴ × 5 × 1,733. Its proper divisors sum to 183,884, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x21D90.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 22
- Digit product
- 0
- Digital root
- 4
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 46,831
- Recamán's sequence
- a(491,547) = 138,640
- Square (n²)
- 19,221,049,600
- Cube (n³)
- 2,664,806,316,544,000
- Divisor count
- 20
- σ(n) — sum of divisors
- 322,524
- φ(n) — Euler's totient
- 55,424
- Sum of prime factors
- 1,746
Primality
Prime factorization: 2 4 × 5 × 1733
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√138,640 = [372; (2, 1, 9, 1, 4, 1, 1, 1, 1, 3, 2, 2, 1, 1, 4, 2, 1, 7, 1, 2, 9, 2, 4, 1, …)]
Representations
- In words
- one hundred thirty-eight thousand six hundred forty
- Ordinal
- 138640th
- Binary
- 100001110110010000
- Octal
- 416620
- Hexadecimal
- 0x21D90
- Base64
- Ah2Q
- One's complement
- 4,294,828,655 (32-bit)
- Scientific notation
- 1.3864 × 10⁵
- As a duration
- 138,640 s = 1 day, 14 hours, 30 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵ρληχμʹ
- Mayan (base 20)
- 𝋱·𝋦·𝋬·𝋠
- Chinese
- 一十三萬八千六百四十
- Chinese (financial)
- 壹拾參萬捌仟陸佰肆拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 138640, here are decompositions:
- 3 + 138637 = 138640
- 11 + 138629 = 138640
- 23 + 138617 = 138640
- 41 + 138599 = 138640
- 53 + 138587 = 138640
- 59 + 138581 = 138640
- 71 + 138569 = 138640
- 179 + 138461 = 138640
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A1 B6 90 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.29.144.
- Address
- 0.2.29.144
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.29.144
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This number falls in the range of US utility patent numbers. If it's a patent, it would be issued as US 138,640 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 138640 first appears in π at position 143,770 of the decimal expansion (the 143,770ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.